Here's How You Can Finally Erase Coffee Rings On Your Mugs With A Dishwasher Tablet - Tasting Table

"Try using a dishwasher tablet to get rid of ugly coffee stains on porcelain and ceramic mugs. Note that dishwasher pods won't work for this hack, only dry, solid tablets, like these BLUELAND Eco-friendly Biobased Dishwasher Tablets on Amazon. Break off a piece of the tablet or cut off the end with a knife before filling your mug with warm water and dissolving the tablet piece inside. Let it sit overnight and then clean it with dish soap and warm water in the morning."

"If you have coffee stains on a glass or stainless steel coffee pot, this method works just as well. Start by boiling water on the stove before adding the boiling water and a piece of a dishwasher tablet (or a whole tablet) to your pot. Let it sit for about 30 minutes, and then pour the water down your sink. Wash the pot with dish soap and water, and if you still see residue or stains, repeat the process again."

Coffee tannins and oils adhere to mug surfaces and chemically bond when exposed to high heat, making stains stubborn and difficult to remove. Dry, solid dishwasher tablets dissolve in warm or boiling water to release enzymatic cleaners and oxygen bleach that break down organic matter, lift stains, and neutralize odors. For porcelain and ceramic mugs, dissolve a tablet piece in warm water, soak overnight, then wash with dish soap. For glass or stainless steel pots, add boiling water and a tablet piece, let sit about 30 minutes, pour out and wash; repeat if residue remains.

Read at Tasting Table